<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Checkbox 未全选的状态 </title>
  <link rel="stylesheet" href="./init-css/normalize.css">
</head>
<body>
  
  <input type="checkbox" name="test" value="" id="test1" indeterminate="true">
  <label for="test1">test1</label>
  
  <input type="checkbox" name="test" value="" id="test2" checked>
  <label for="test2">test2</label>
  
  <input type="checkbox" name="test" value="" id="test3">
  <label for="test3">test3</label>

  <p>1</p>
  <p>2</p>
  <p>3</p>
  <script>

  
  </script>
</body>
</html>